diff --git a/defines.h b/defines.h
index 4e4234c..c3c7bb9 100644
--- a/defines.h
+++ b/defines.h
@@ -1,5 +1,8 @@
 #define STATUS_QUIT_PROGRAM 1
 #define STATUS_RUN_BACKEND 2
+#define STATUS_UPDATE_SCREEN_MASK 12 // 1100
+#define STATUS_UPDATE_SCREEN_0 4
+#define STATUS_UPDATE_SCREEN_1 8
 
 #define FILE_MODIFIERS_HIDDEN_FILES 1
 #define FILE_MODIFIERS_SORT_BITMASK 126 // 00000000000000000000000001111110